FAA Advisory Circular 43.13-1B
Acceptable Methods, Techniques, and Practices
Aircraft Inspection and Repair
AC 43.13-1B | 12. Aircraft Avionics Systems | 4. Pitot/Static System | 12-57. System Leak Test
AC 43.13-1B CHG 1
9/27/01
Figure 12-6. Pitot/Static Tube Head
b. Check to ensure the water drains
freely. If a problem is experienced with the
pitot-static system drainage or freezing at alti
tude, and the tubing diameter is less than
3/8-inch, replace it with larger tubing.
c. Check the pitot tube for corrosion.
(1) The pitot probe should not have
any corrosion within ½-inch of the probe tip.
(2) Make sure there is no flaking
which forms pits and irregularities in the sur
face of the tube.
NOTE: It is essential that the static air
system be drained after the airplane
has been exposed to rain.
12-57. SYSTEM LEAK TEST.
a. Pitot-static leak tests should be made
with all instruments connected to assure that
no leaks occur at instrument connections.
Such tests should be accomplished whenever a
connection has been loosened or an instrument
replaced.
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Par 12-56